CN108019150B - A kind of boring method and system - Google Patents
A kind of boring method and system Download PDFInfo
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- CN108019150B CN108019150B CN201610972112.2A CN201610972112A CN108019150B CN 108019150 B CN108019150 B CN 108019150B CN 201610972112 A CN201610972112 A CN 201610972112A CN 108019150 B CN108019150 B CN 108019150B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 238000004458 analytical method Methods 0.000 claims abstract description 13
- 238000013459 approach Methods 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims description 37
- 230000005251 gamma ray Effects 0.000 claims description 24
- 238000013461 design Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 description 11
- 241001074085 Scophthalmus aquosus Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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Abstract
The present invention relates to oil and gas prospect field, a kind of boring method and system are provided, this method comprises: the analysis based on lithology and electrical property feature to target zone reservoir, is arranged early warning control point for reservoir in the track of drill bit；Based on seismic interpretation data and geological model, structure interpretation comparison is carried out to target zone, structural configuration and high-quality shale distribution characteristics are analyzed, to determine the vertical depth and coordinate of A target spot；Judge position of the drill bit on vertical using drill-following natural gamma measurement, special well logging real time data, calculates stratigraphic dip, the direction of strata near prediction drill bit；According to the stratigraphic dip, controls drill bit and land in A target spot；According to drill bit in the practical landing approach of A target spot, TRAJECTORY CONTROL scheme of the drill bit when entering horizontal segment is selected；And using drill-following natural gamma measurement and well logging real time data, and drill bit is controlled in the track of horizontal segment according to the gamma value at the early warning control point.
Description
Technical field
The present invention relates to oil and gas Exploration Domains, and in particular, to a kind of boring method and application this method
System.
Background technique
Horizontal well technology is widely applied in Chinese shale gas exploration and development in recent years, and production is built in the exploitation in shale gas field is
Increase reservoir drainage area by horizontal well to realize.Long horizontal sections improve the production capacity of shale gas, reduce opening for shale gas
Adopt cost.Shale gas horizontal well is to meet production needs, and design level section is longer, generally in 1400-1500m or so, horizontal well
Section to guarantee to walk in relatively optimal reservoir, into the high-quality shale Drilling ratio after horizontal segment be measure horizontal well quality and at
The key index lost, thereby it is ensured that the higher high-quality shale Drilling ratio of horizontal segment is that shale gas drilling well obtains good oil gas achievement
Basic premise, and improve exploration and development effect important means.
Most common controlled level well track technology is Geosteering Drilling Technology, mainly a variety of by measurement while drilling
Geology and engineering parameter carry out Real-Time Evaluation and comparison to drilled strata, and control well track is adjusted according to comparing result,
In simple structure and high degree of prospecting area, higher high-quality shale Drilling ratio may be implemented.But in actual application, low
Degree of prospecting area is due to lacking high accuracy surface modelling data, it is difficult to realize to the good pre- of the high-quality shale Distribution Characteristics in underground
It surveys.Each exploratory area complexity of structures is different simultaneously, there are well shake particularly thorny and geological design and it is real bore between stratum exist compared with
The difficult point of large deviation will all make horizontal well path deviate top quality shale section its prediction slightly deviation.In addition, being surveyed with boring
Measuring appratus has 5-15 meters of measurement blind area away from shaft bottom, cannot reflect drill bit present position geologic information in time, when occurring texture
It makes or stratigraphic dip changes slightly larger situation, discovery track is waited to deviate high-quality shale and be adjusted, then track adjustment is back to
In high-quality shale, the practical horizontal segment for deviateing high-quality shale has reached 20-50 meters, causes whole high-quality shale Drilling ratio relatively low.
Summary of the invention
The object of the present invention is to provide a kind of boring method, this method can accurately control bit course, make its without departing from
The reservoir of high-quality shale, to effectively improve the accuracy rate bored in drilling process and meet high-quality shale.
Another aspect provides the well systems of the above-mentioned boring method of application can using the well system
Real-time control and adjustment well track, guarantee that drill bit does not depart from the reservoir of target zone rock, it is high-quality to improve purpose in drilling process
The Drilling ratio of shale.
To achieve the goals above, the present invention provides a kind of boring method, this method comprises: based on to target zone reservoir
Early warning control point is arranged for reservoir in the analysis of lithology and electrical property feature in the track of drill bit, and the early warning control point is used for
Position of the auxiliary control drill bit in bored borehole mark, prevents drill bit to be detached from reservoir；Using seismic interpretation data and geological model as base
Plinth carries out structure interpretation comparison to target zone, structural configuration and high-quality shale distribution characteristics is analyzed, to determine the vertical depth of A target spot
And coordinate；Judge that position of the drill bit on vertical, calculating stratum are inclined using drill-following natural gamma measurement, special well logging real time data
The direction of strata near drill bit is predicted at angle；According to the stratigraphic dip, controls drill bit and land in A target spot；According to drill bit in A target
The practical landing approach of point selectes TRAJECTORY CONTROL scheme of the drill bit when entering horizontal segment；And it is surveyed using drill-following natural gamma
Amount and well logging real time data, and drill bit is controlled in the track of horizontal segment according to the gamma value at the early warning control point.
Preferably, described landed according to stratigraphic dip control drill bit in A target spot includes: when the stratigraphic dip is upper
Incline direction when, control well track vertical depth 20-30m before A target spot, hole angle reaches 85-86 degree；When the stratigraphic dip is
When downdip direction, well track vertical depth 40-50m before A target spot is controlled, hole angle reaches 82-84 degree；And angle holding drilling arrives
At the top of reservoir, hole angle is adjusted before entering A target spot to maximum hole angle.
Preferably, it includes: when A target spot is by planned course that the practical landing approach of A target spot, which selectes TRAJECTORY CONTROL scheme,
Lu Shi does not adjust drill bit；When A target spot shifts to an earlier date compared with reservoir prediction, hole angle is adjusted, drill bit is made to continue to chase after layer；When A target spot
When opposite reservoir prediction lag, controlling drill bit with current hole angle is that stable hole angle carries out chasing after layer.
Preferably, described to control drill bit in horizontal segment using drill-following natural gamma measurement and special well logging real time data
Track includes: to judge that shaft bottom hole angle and stratum relativeness, amendment design well track are adjusted in real time using orientation natural gamma
Whole control drilled wellbore trajectories.
Preferably, described to judge position of the drill bit on vertical using drill-following natural gamma measurement, special well logging real time data
It sets, calculates stratigraphic dip, predict that the nearly drill bit direction of strata includes: to lead a well characteristic point natural gamma and level by comparing identification
Section drill-following natural gamma, variation of the cooperation well logging analysis data in the characteristic point, thus two characteristic points of detection level section
Between horizontal displacement L between vertical depth difference H and two characteristic points, the calculation formula of stratigraphic dip θ is such as are as follows: θ=atan (H/L).
Preferably, described using orientation natural gamma judge shaft bottom hole deviation and stratum relativeness includes: using with boring survey
The bit orientation of amount judges bit location in the upper and lower value difference of natural gamma data, when natural gamma value upper value it is small, it is lower value it is big when,
Determine drill bit early warning control point on gamma ray curve spike top, when natural gamma upper value it is big, it is lower value it is small when, determine bore
The spike lower part at head early warning control point on gamma ray curve determines to bore when the upper value of natural gamma value is consistent with lower value
Head on gamma ray curve at the spike at early warning control point at the top of；And bit location is confirmed by special logging means, and
The relativeness on shaft bottom hole deviation and stratum is determined according to the position of drill bit.
Based on another aspect of the present invention, a kind of well system is also provided, which includes: that early warning control point determines mould
Early warning is arranged in the track of drill bit for reservoir for the analysis based on lithology and electrical property feature to target zone reservoir in block
Control point, the early warning control point are used to assist position of the control drill bit in bored borehole mark, and drill bit is prevented to be detached from reservoir；A target
Point determining module, for carrying out structure interpretation comparison to target zone, analyzing structure based on seismic interpretation data and geological model
Appearance state and high-quality shale distribution characteristics, to determine the vertical depth and coordinate of A target spot；Stratigraphic dip determining module, for using with
It bores natural gamma logging, special well logging real time data and judge position of the drill bit on vertical, calculate stratigraphic dip, predict that drill bit is attached
The close direction of strata；A target spot Landing Control module controls drill bit and lands in A target spot according to the stratigraphic dip, and according to brill
Head selectes TRAJECTORY CONTROL scheme of the drill bit when entering horizontal segment in the practical landing approach of A target spot；And trajectory of horizontal control
Molding block, for controlling drill bit in water using drill-following natural gamma measurement and well logging real time data, and according to early warning control point
The track of flat section.
Preferably, the A target spot Landing Control module includes: to chase after a layer control module, for being when the target zone reservoir
When updip direction, well track vertical depth 20-30m before A target spot is controlled, hole angle reaches 85-86 degree；When reservoir is the side of having a down dip
Xiang Shi, controls well track vertical depth 40-50m before A target spot, and hole angle reaches 82-84 degree；And then angle holding drilling to design
At the top of reservoir, hole angle is adjusted before entering A target spot to maximum hole angle.
Preferably, the A target spot Landing Control module includes A target spot landing plans selecting module, for when A target spot is by setting
When counting track landing, drill bit is not adjusted；When A target spot shifts to an earlier date compared with reservoir prediction, hole angle is adjusted, drill bit is made to continue to chase after
Layer；When A target spot is lagged with respect to reservoir prediction, controlling drill bit with current hole angle is that stable hole angle carries out chasing after layer.
Preferably, the trajectory of horizontal control module includes: well track adjustment module, is sentenced using orientation natural gamma
Disconnected shaft bottom hole angle and stratum relativeness, amendment design well track, the drilled wellbore trajectories of adjustment control in real time.
Preferably, the stratigraphic dip determining module by compare identification lead a well characteristic point natural gamma and horizontal segment with
Bore natural gamma, variation of the cooperation well logging analysis data in the characteristic point, to hang down between two characteristic points of detection level section
Horizontal displacement L between deep difference H and two characteristic points, and calculate θ: θ=atan of stratigraphic dip (H/L) according to the following formula.
Preferably, the well track adjustment module includes: that bit location judges mould, for the drill bit using measurement while drilling
Orientation judges bit location in the upper and lower value difference of natural gamma data, when natural gamma value upper value it is small, it is lower value it is big when, determine drill bit
The spike top at early warning control point on gamma ray curve, when natural gamma upper value it is big, it is lower value it is small when, determine drill bit in nature
The spike lower part at early warning control point on gamma curve determines drill bit in nature when the upper value of natural gamma value is consistent with lower value
Top at the spike at early warning control point on gamma curve；And the relativeness determining module of shaft bottom hole deviation and stratum, for borrowing
Special logging means confirmation bit location is helped, and determines the relativeness on shaft bottom hole deviation and stratum according to the position of drill bit.
Through the above technical solutions, bit course can be accurately controlled using the boring method and well system, and
Real-time control and adjustment well track, guarantee that drill bit does not depart from the reservoir of target zone rock, improve the high-quality page of purpose in drilling process
The Drilling ratio of rock.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of according to embodiments of the present invention one boring method；
Fig. 2 is the preferred embodiment flow chart of according to embodiments of the present invention one boring method；
Fig. 3 be according to embodiments of the present invention one drilling in method another preferred embodiment flow chart；
Fig. 4 is the structure chart of according to embodiments of the present invention two well system；
Fig. 5 is the implementation figure of the drilling method and system using the above embodiment of the present invention；
Fig. 6 is the control effect figure of the boring method and system using the above embodiment of the present invention.
Description of symbols
100: early warning control point determining module 200:A target spot determining module
300: stratigraphic dip determining module 400:A target spot Landing Control module
500: trajectory of horizontal control module
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Fig. 1 is the flow chart of according to embodiments of the present invention one boring method.As shown in Figure 1, this method includes following step
It is rapid:
In the step s 100, based on the layer lithology of the reservoir to target zone rock and the analysis of electrical property feature, exist for reservoir
Early warning control point is set in the track of drill bit, the early warning control point is used to assist position of the control drill bit in bored borehole mark,
Drill bit is prevented to be detached from reservoir.
Early warning control point can be set in inclination section or horizontal segment, when early warning control point is arranged, can emphasis be directed to conduct
The gamma ray curve form of the reservoir of target zone is analyzed, and is compiled to the characteristic peaks occurred on gamma ray curve
Number, the early warning control point can be one or more of the corresponding point of characteristic peaks that these are numbered.
In step s 200, based on seismic interpretation data and geological model, structure interpretation comparison is carried out to target zone,
Structural configuration and high-quality shale distribution characteristics are analyzed, to determine the vertical depth and coordinate of A target spot.It simultaneously can in the same way really
Determine the vertical depth and coordinate of B target spot, A target spot and B target spot are two target points in drilling process, are calculated according to certain data
Predetermined target point out indicates the final direction of well track, and A target spot is first terminal of well track, in horizontal well
In, A target spot is the terminal of inclination section, i.e. the entrance of horizontal segment, and B target spot is exactly second terminal of well track.
In step S300, judge drill bit on vertical using drill-following natural gamma measurement, special well logging real time data
Position calculates stratigraphic dip, predicts the direction of strata near drill bit.
Natural gamma logging is the method along the natural gamma ray intensity of well track measurement rock stratum, and rock generally all contains
There is the radioactive element of different number, and constantly release ray, different rock stratum is different because its lithology can radiate to be penetrated
Line is possible to mark off the geologic section of drilling, determines that sand shale is cutd open using these rules according to natural gamma logging result
Sandstone shale content and the permeability of rock stratum is qualitatively judged in face.The present embodiment is exactly the lithology institute natural gamma according to reservoir
Curve controls the track of drill bit.Special logging method in the art typically refer to element well logging and mineral well logging (XRD,
XRF).Using the performance data of rock stratum near drill-following natural gamma measurement and the available brill of special well logging, these characteristics are utilized
Data can calculate the trend on the stratum near drill bit.
In the present embodiment, a well characteristic point natural gamma and horizontal segment drill-following natural gal can be led by comparing identification
Horse, variation of the cooperation well logging analysis data in the characteristic point, thus vertical depth difference H between two characteristic points of detection level section,
And horizontal displacement L between two characteristic points, the calculation formula of stratigraphic dip θ is such as are as follows: θ=atan (H/L).Wherein characteristic point be
In drilling process, in order to control or the needs of calculating parameter according to natural gamma survey and real-time logging data select, quantity
There is no limit can need to choose, for example, when drill bit is in the inclination section or water of horizontal well according to practical control or calculating with position
When flat section, two characteristic points in track are selected in order to predict stratigraphic dip.
In step S400, according to the stratigraphic dip, controls drill bit and land in A target spot.
As shown in Fig. 2, step sS400 may comprise steps of:
It in step S410, lands to control drill bit with the track of smooth gradual change, not because the difference of stratigraphic dip generates
The landing approach of Trajectory Catastrophe, A target spot can be preferred according to the difference of the stratigraphic dip near drill bit are as follows: when the stratigraphic dip
When for updip direction, well track vertical depth 20-30m before A target spot is controlled, hole angle reaches 85-86 degree；When the stratum is inclined
When angle is downdip direction, well track vertical depth 40-50m before A target spot is controlled, hole angle reaches 82-84 degree；
In the step s 420, it when bit course is smooth, at the top of angle holding drilling to reservoir, is adjusted before entering A target spot
Hole angle is to maximum hole angle.
In step S500, according to drill bit in the practical landing approach of A target spot, rail of the drill bit when entering horizontal segment is selected
Mark control program.The entrance of A target spot, that is, horizontal well horizontal segment, drill bit need to further determine whether standard after the landing of A target spot
Target in really, and then pierce horizontal segment.
In order to guarantee the drill bit accurately target in A target, and it can smoothly enter into horizontal segment, can be practical according to the A target spot
TRAJECTORY CONTROL scheme when land mode is selected in into horizontal segment, the selection of control program includes: when A target spot is by planned course
When landing, drill bit is not adjusted；When A target spot shifts to an earlier date compared with reservoir prediction, hole angle is adjusted according to real-time logging data, makes to bore
Head continues to chase after layer；When A target spot is lagged with respect to reservoir prediction, controlling drill bit with current hole angle is that stable hole angle carries out
Chase after layer.Chase after layer i.e. when do not bored at planned course point meet purpose reservoir when, need to adjust hole angle make track land in purpose
In reservoir, that is, ensure target in A target spot.
In step S600, controlled using drill-following natural gamma measurement and well logging real time data, and according to the early warning
Point control drill bit is in the track of horizontal segment.
Drill bit enters after horizontal segment, can use orientation natural gamma and judges shaft bottom hole angle and stratum relativeness,
Amendment design well track, the drilled wellbore trajectories of adjustment control in real time, to guarantee that drill bit does not depart from reservoir in drilling process.
Wherein, judge that shaft bottom hole deviation may comprise steps of with stratum relativeness using orientation natural gamma:
In step 610, drill bit position is judged in the upper and lower value difference of gamma ray curve using the bit orientation of measurement while drilling
It sets, judgment method is, when natural gamma value upper value is small, lower value is big, determines that drill bit early warning on gamma ray curve controls
Point spike top, when natural gamma upper value it is big, it is lower value it is small when, determine drill bit early warning control point on gamma ray curve point
Peak lower part determines the point at drill bit early warning control point on gamma ray curve when the upper value of natural gamma value is consistent with lower value
Top at peak.
In step S620, bit location is confirmed by special logging means, and shaft bottom well is determined according to the position of drill bit
Tiltedly with the relativeness on stratum.It is possible to further adjust hole angle according to the relativeness of shaft bottom hole deviation and stratum, to protect
Card drill bit carries out drilling well in reservoir.
It should be noted that hole angle is angle of the drill bit direction with respect to hole axis, and stratigraphic dip is reservoir institute
Stratum with respect to earth's surface horizontal plane angle.
It controls general principle of the drill bit in the track of horizontal segment and is to ensure that hole angle and stratigraphic dip keep relatively minimal folder
Angle, so that drill bit is made not drill the face layer or subsurface of reservoir, such as: current hole angle upwarps angle greater than stratum top rade
Degree, it is necessary to turn hole angle down downwards and realize that track adjusts downwards, it is ensured that reservoir face layer is not drilled, similarly, such as current hole deviation
Angle tilt angled down is greater than stratum tilt angled down, it is necessary to turn hole angle down upwards and realize that track adjusts upward, it is ensured that not drill mesh
Layer subsurface.Being reflected on gamma ray curve to the adjustment control of drill bit is point of the control drill bit in gamma ray curve
It is wound on peak, this method is easy to implement, is less than 5m to dipping and heaving in the control of well track, can keep hole angle and stratum
Inclination angle carries out drilling well with -0.5~0.5 degree of angle.Due to the possible more than just one of the gamma spike of measurement while drilling, thus while
Value up and down in step S510 according to natural gamma value may determine that drill bit is in the position at the top of spike, but at this time cannot
Which peak location confirmation drill bit is in, it is therefore desirable to the specific location of drill bit is determined by special logging means.
In the present embodiment, the characteristic peaks of gamma ray curve can also be classified, determines early warning control to be classified
It is processed, to realize more accurate TRAJECTORY CONTROL.
Fig. 4 is the structure chart of according to embodiments of the present invention two well system.As shown in figure 4, the system includes: early warning control
System point determining module 100, for being bored for reservoir based on the layer lithology of the reservoir to target zone rock and the analysis of electrical property feature
Early warning control point is set in the track of head, and the early warning control point is used to assist position of the control drill bit in bored borehole mark, prevent
Only drill bit is detached from reservoir；A target spot determining module 200, for based on seismic interpretation data and geological model, to target zone into
Row structure interpretation comparison, analyzes structural configuration and high-quality shale distribution characteristics, to determine the vertical depth and coordinate of A target spot；Incline on stratum
Angle determining module 300, for judging position of the drill bit on vertical using drill-following natural gamma measurement, special well logging real time data
It sets, calculates stratigraphic dip, predict the direction of strata near drill bit；A target spot Landing Control module 400, according to the stratigraphic dip,
Control drill bit A target spot land, and according to drill bit A target spot practical landing approach, select drill bit enter horizontal segment when
TRAJECTORY CONTROL scheme；And trajectory of horizontal control module 500, for being provided in real time using drill-following natural gamma measurement and well logging
Material and early warning control point control drill bit are in the track of horizontal segment.
Wherein, the stratum stratigraphic dip determining module can lead well characteristic point natural gamma and water by comparing identification
Flat section drill-following natural gamma, variation of the cooperation well logging analysis data in the characteristic point, thus two features of detection level section
Horizontal displacement L between vertical depth difference H and two characteristic points between point, and θ: θ=atan of stratigraphic dip is calculated according to the following formula
(H/L).Characteristic point can need to choose in well track according to actual TRAJECTORY CONTROL and calculating.
Described 400 pieces of A target spot Landing Control mould may include: to chase after a layer control module, for working as the storage of the target zone rock
When layer is updip direction, well track vertical depth 20-30m before A target spot is controlled, hole angle reaches 85-86 degree；Under reservoir is
Incline direction when, control well track vertical depth 40-50m before A target spot, hole angle reaches 82-84 degree；And then angle holding drilling arrives
It designs at the top of reservoir, hole angle is adjusted before entering A target spot to maximum hole angle.
The A target spot Landing Control module can also include A target spot landing plans selecting module, for when A target spot is by setting
When counting track landing, drill bit is not adjusted；When A target spot shifts to an earlier date compared with reservoir prediction, hole angle is adjusted, drill bit is made to continue to chase after
Layer；When A target spot is lagged with respect to reservoir prediction, controlling drill bit with current hole angle is that stable hole angle carries out chasing after layer.
The trajectory of horizontal control module may include: well track adjustment module, be judged using orientation natural gamma
Shaft bottom hole angle and stratum relativeness, amendment design well track, the drilled wellbore trajectories of adjustment control in real time.
The well track adjustment module may include: that bit location judges mould, for the drill bit side using measurement while drilling
Position in natural gamma data upper and lower value difference judge bit location, and when natural gamma value upper value is small, lower value is big, judgement drill bit exists
Gamma ray curve spike top, when natural gamma upper value it is big, it is lower value it is small when, determine drill bit under gamma ray curve spike
Portion, when the upper value of natural gamma value is consistent with lower value, determine drill bit at the gamma ray curve spike at the top of；And shaft bottom well
It tiltedly with the relativeness determining module on stratum, is used to confirm bit location by special logging means, and according to the position of drill bit
Determine the relativeness on shaft bottom hole deviation and stratum.
Wherein, the early warning control point can be classified its characteristic peaks point according to the separated time to gamma curve, from
And the early warning control point of multiple classifications is set.
Well system in embodiment two can be used for implementing the boring method, therefore, because detail content is in embodiment
It was described in one, and was not repeated to describe in embodiment.
Fig. 5 is the implementation figure of the drilling method and system using the above embodiment of the present invention.The drilling well is applied in Fig. 5
The interface schematic diagram of system, and the process to bit course real-time control is illustrated, wherein No. two peaks and No. three peaks are early warning control
It is processed, guarantee drill bit between No. two peaks and No. three peaks, that is, can guarantee that well track does not depart from the reservoir of high-quality shale, in drill bit
During advance in the stratum except reservoir or reservoir, changes with brill gamma curve and represent stratigraphic dip hair at this time
Given birth to variation, thus detect with bore gamma curve change when, calculate stratigraphic dip, and then according to current drill bit relative to
The position of the spike at early warning control point and stratigraphic dip adjust the hole angle of drill bit, make drill bit gamma curve kurtosis into
Row drilling well.As shown in figure 5, in the C point of gamma ray curve, drill bit enters reservoir first with 83 ° of hole angle, detects gamma
Curve rises, and it is 2.26 ° that stratigraphic dip is calculated at this time, it is therefore desirable to adjust hole angle to putting down between 87~88 degree, it
Row is in stratum direction drilling well horizontal segment.In D point, gamma value decline, it is therefore desirable to which lowering hole angle is 87 °, makes drill bit close to two
Number peak.Later, with the adjustment of hole angle, gamma value rises to E point, and drill bit reaches No. two peaks at this time, because No. two peaks are early warning
Control point needs to control drill bit no more than No. two peaks, needs to adjust the hole angle of drill bit at this time, decline gamma value.In F point
When, drill bit has passed through No. two peaks, and adjustment hole angle pierces its parallel formation direction between 88~89 °.In G point, detect
Gamma value rises, and adjusts hole angle to 89 °, makes to wear stratum thereon, meets high-quality shale reservoir to bore, after drill bit crosses over No. three peaks,
Gamma value changes, that is, represents stratigraphic dip herein and changed, but still declines to gamma value after hole angle adjustment, needs
Continue to increase hole angle, makes to wear stratum on drill bit.In H point, gamma value rises, and calculating stratigraphic dip is 1 °, passes through collection
The orientation natural gamma data arrived, accurate judgement to track are located at No. two peaks lower part, adjust hole angle with 89~90 degree of drilling wells, it
Stratigraphic dip is less than 1 degree afterwards, i.e., stratum tends to be horizontal, and gamma curve tends to be steady at this time, so that hole angle is parallel to stratum and pierces
.
Fig. 6 is the control effect figure of the boring method and system using the above embodiment of the present invention.In Fig. 6, A point and
B point represents A target spot and B target spot, and MD indicates the oblique depth of the point, and TVD represents the vertical depth of the point.1 point and 2 points is to show wellbore
TRAJECTORY CONTROL effect and two reference points of well track chosen.From fig. 6 it can be seen that utilizing the boring method and brill
Well system effectively makes drill bit preceding well in reservoir, when drill bit reaches reservoir boundaries, by the real-time adjustment of horizontal segment, makes to bore
Head rail mark gradually adjusts upwards, to guarantee reservoir of the well track without departing from high-quality shale.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (12)
1. a kind of boring method, which is characterized in that this method comprises:
Based on the analysis of lithology and electrical property feature to target zone reservoir, early warning control is set in the track of drill bit for reservoir
Point；
Based on seismic interpretation data and geological model, structure interpretation comparison is carried out to the reservoir of layer as a purpose, analyzes structure
Appearance state and high-quality shale distribution characteristics, to determine the vertical depth and coordinate of A target spot；
Judge position of the drill bit on vertical using drill-following natural gamma measurement, special well logging real time data, calculating stratigraphic dip,
Predict the direction of strata near drill bit；
According to the stratigraphic dip, controls drill bit and land in A target spot；
According to drill bit in the practical landing approach of A target spot, TRAJECTORY CONTROL scheme of the drill bit when entering horizontal segment is selected；And
Drill bit is controlled in horizontal segment using drill-following natural gamma measurement and well logging real time data, and according to the early warning control point
Track, wherein it is described according to the stratigraphic dip control drill bit A target spot landing include:
When the stratigraphic dip is updip direction, control well track vertical depth 20-30m, hole angle before A target spot reach
85-86 degree；When the stratigraphic dip is downdip direction, control well track vertical depth 40-50m, hole angle before A target spot reach
To 82-84 degree；And
At the top of angle holding drilling to reservoir, hole angle is adjusted before entering A target spot to maximum hole angle.
2. boring method according to claim 1, which is characterized in that the practical landing approach of A target spot selectes track control
Scheme processed includes:
When A target spot lands by planned course, drill bit is not adjusted；
When A target spot shifts to an earlier date compared with reservoir prediction, hole angle is adjusted, drill bit is made to continue to chase after layer；
When A target spot is lagged with respect to reservoir prediction, controlling drill bit with current hole angle is that stable hole angle carries out chasing after layer.
3. boring method according to claim 1, which is characterized in that described using drill-following natural gamma measurement and special
Well logging real time data controls drill bit in the track of horizontal segment
Shaft bottom hole angle and stratum relativeness, amendment design well track, in real time adjustment control are judged using orientation natural gamma
Drilled wellbore trajectories processed.
4. boring method according to claim 1, described to be sentenced using drill-following natural gamma measurement, special well logging real time data
Position of the breaking of rod head on vertical, calculates stratigraphic dip, predicts that the nearly drill bit direction of strata includes:
A well characteristic point natural gamma and horizontal segment drill-following natural gamma are led by comparing identification, cooperation well logging analysis data are in institute
The variation in characteristic point is stated, thus horizontal displacement between vertical depth difference H and two characteristic points between two characteristic points of detection level section
L, the calculation formula of stratigraphic dip θ is such as are as follows: θ=atan (H/L).
5. boring method according to claim 3, which is characterized in that described to judge shaft bottom hole deviation using orientation natural gamma
Include: with stratum relativeness
Bit location is judged in the upper and lower value difference of natural gamma data using the bit orientation of measurement while drilling, when in natural gamma value
Be worth small, lower value it is big when, determine the spike top at drill bit early warning control point on gamma ray curve, when natural gamma upper value is big,
Lower value hour will determine the spike lower part at drill bit early warning control point on gamma ray curve, when the upper value of natural gamma value is under
When being worth consistent, determine drill bit on gamma ray curve at the spike at early warning control point at the top of；And
Bit location is confirmed by special logging means, and determines that shaft bottom hole deviation and the opposite of stratum are closed according to the position of drill bit
System.
6. boring method according to any one of claims 1-5, which is characterized in that the early warning control point includes classification
Early warning control point.
7. a kind of well system, which is characterized in that the system includes:
Early warning control point determining module exists for the analysis based on lithology and electrical property feature to target zone reservoir for reservoir
Early warning control point is set in the track of drill bit；
A target spot determining module, for carrying out structure interpretation pair to target zone based on seismic interpretation data and geological model
Than structural configuration and high-quality shale distribution characteristics being analyzed, to determine the vertical depth and coordinate of A target spot；
Stratigraphic dip determining module, for judging drill bit vertical using drill-following natural gamma measurement, special well logging real time data
On position, calculate stratigraphic dip, predict drill bit near the direction of strata；
A target spot Landing Control module controls drill bit and lands in A target spot according to the stratigraphic dip, and according to drill bit in A target spot
Practical landing approach, select drill bit enter horizontal segment when TRAJECTORY CONTROL scheme；And
Trajectory of horizontal control module, for utilizing drill-following natural gamma measurement and well logging real time data, and according to described pre-
Alert control point control drill bit is in the track of horizontal segment, wherein the A target spot Landing Control module includes:
A layer control module is chased after, for controlling well track vertical depth before A target spot when the target zone reservoir is updip direction
20-30m, hole angle reach 85-86 degree；When reservoir is downdip direction, well track vertical depth 40- before A target spot is controlled
50m, hole angle reach 82-84 degree；And hole angle then is adjusted before entering A target spot at the top of angle holding drilling to design reservoir
To maximum hole angle.
8. well system according to claim 7, which is characterized in that the A target spot Landing Control module includes A target spot
Land Scheme Choice module, for not adjusted to drill bit when A target spot lands by planned course；When A target spot is mentioned compared with reservoir prediction
When preceding, hole angle is adjusted, drill bit is made to continue to chase after layer；When A target spot is lagged with respect to reservoir prediction, drill bit is controlled with current hole deviation
Angle is that stable hole angle carries out chasing after layer.
9. well system according to claim 7, which is characterized in that the trajectory of horizontal control module includes:
Well track adjusts module, judges shaft bottom hole angle and stratum relativeness, amendment design well using orientation natural gamma
Eye track, the drilled wellbore trajectories of adjustment control in real time.
10. well system according to claim 9, the stratigraphic dip determining module leads a well feature by comparing identification
Point natural gamma and horizontal segment drill-following natural gamma, variation of the cooperation well logging analysis data in the characteristic point, to detect
Horizontal displacement L between vertical depth difference H and two characteristic points between two characteristic points of horizontal segment, and stratum is calculated according to the following formula
Inclination angle theta: θ=atan (H/L).
11. well system according to claim 9, which is characterized in that the well track adjusts module and includes:
Bit location judgment module is bored for the bit orientation using measurement while drilling in the upper and lower value difference judgement of natural gamma data
Head position determines drill bit on gamma ray curve under the spike at early warning control point when natural gamma value upper value is small, lower value is big
Portion, when natural gamma upper value it is big, it is lower value it is small when, determine drill bit early warning control point on gamma ray curve spike lower part, when
When the upper value of natural gamma value is consistent with lower value, determine drill bit on gamma ray curve at the spike at early warning control point at the top of；
And
The relativeness determining module of shaft bottom hole deviation and stratum is used for by special logging means confirmation bit location, and according to
The position of drill bit determines the relativeness on shaft bottom hole deviation and stratum.
12. well system according to any one of claims 7-11, which is characterized in that the early warning control point determines mould
The early warning control point of multiple classifications is arranged in block.
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| CN110821403B (en) * | 2019-10-25 | 2021-09-14 | 中国石油天然气股份有限公司 | Drilling trajectory control method and device and storage medium |
| CN112761570A (en) * | 2019-11-04 | 2021-05-07 | 中国石油化工股份有限公司 | Natural gas upwarping horizontal well completion method |
| CN111852451B (en) * | 2020-07-29 | 2023-04-25 | 江苏达坦智慧能源有限公司 | Drilling three-dimensional imaging system |
| CN114427451B (en) * | 2020-09-11 | 2024-06-21 | 中国石油化工股份有限公司 | Method for acquiring shale reservoir static parameters based on while-drilling data |
| CN113464121B (en) * | 2021-05-12 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Method for determining gamma geosteering drilling track of azimuth while drilling |
| CN113700470B (en) * | 2021-06-18 | 2024-05-24 | 中国石油化工股份有限公司 | Correction method for logging data of directional well |
| CN113700475B (en) * | 2021-07-28 | 2024-06-07 | 中石化石油工程技术服务有限公司 | Method and device for identifying logging while drilling of micro-structure well, storage medium and electronic equipment |
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